Mediators and Moderators of Auditory Training

Inclusion Criteria: * 18-30 and 60-85 years of age. * No self-reported auditory difficulties and normal or near-normal hearing sensitivity as measured by SRTs. * Older adults aged 50-85 should have no more than typical hearing loss for their age and no evidence of dementia. * Fluent in English and/or Spanish Exclusion Criteria: * Abnormal vision or hearing prohibitive of training * History of seizures, focal brain lesion, or head injury with loss of consciousness * Physical handicap (motor or perceptual) that would impede training procedures * Medical illness requiring treatment during the study timeline * Social, educational or economic hardship prohibitive to training schedule * Concurrent enrollment in other cognitive training studies * History of major psychiatric illness, including psychosis, bipolar disorder, depression, alcohol or substance abuse, recent bereavement * Plans to travel out of the area for more than 1 week during the intervention period * Residence too far from the testing site, which would prevent attending the testing sessions (\> 60 miles) * Not being proficient enough in English or Spanish that would prevent following and understanding all instructions and completing all testing sessions Additional exclusion criteria for older adults: * Diagnosis of dementia or other neurological disease, including mild cognitive impairment (MCI) * Telephone-Montreal Cognitive Assessment (t-MoCA) score of 16 or less or Montreal Cognitive AssessmentMoCA) score of 20 or less